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多對您說：您解說錯誤了，還在保留此帖。基本觀念如下： What's mean of Fiber stress The tensile or compressive stress on the fibersof a fiber metal or other fibrous material, especially when fiber orientationis parallel with the neutral axis. Local stress through a small area (a point orline) on a section where the stress is not uniform, as in a beam under bendingload. MaximumFiber Stress Maximumtensile or compressive stress in a homogeneous flexure or torsion testspecimen. For a specimen loaded as a simple beam at its midpoint, maximum fiberstress occurs at mid-span and may be calculated by the formula (for rectangularspecimens):
S= (3P·L)/(2bd2) whereS is maximum fiber stress; P, load; L, span; b, width of thebeam; and d, depth of the beam. For acircular cross section member loaded in torsion, maximum fiber stress may becalculated by the following formula: S = (T·R)/J whereT is twisting moment; R, original outer radius and J, polar moment of inertia of originalcross section. Reference : McGraw-Hill Dictionary of Scientific& Technical Terms, 6E,
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